/* ============================================================
   CALMWRITE - Design System & Styles
   ============================================================
   Tema: Cozy, Lo-fi, Minimalista, Study With Me
   ============================================================ */

/* ----- RESET & BASE ----- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* ----- TYPOGRAPHY ----- */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Atkinson Hyperlegible', 'Nunito', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;
  --line-height-tight: 1.25;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;

  /* ----- SPACING ----- */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* ----- BORDERS ----- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* ----- SHADOWS ----- */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(255, 255, 255, 0.05);

  /* ----- ANIMATIONS ----- */
  --anim-fast: 200ms;
  --anim-normal: 300ms;
  --anim-slow: 500ms;
  --anim-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --anim-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ----- THEME: DARK (default) ----- */
  --bg-primary: #1a1d23;
  --bg-secondary: #1f2937;
  --bg-tertiary: #232634;
  --bg-glass: rgba(31, 41, 55, 0.6);
  --bg-modal: #232634;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-hover: rgba(255, 255, 255, 0.06);

  --text-primary: #ececec;
  --text-secondary: #a0aec0;
  --text-tertiary: #718096;
  --text-muted: #4a5568;

  --accent: #7c9eb2;
  --accent-light: #a8d5e2;
  --accent-glow: rgba(124, 158, 178, 0.2);
  --success: #68d391;
  --warning: #f6ad55;
  --error: #fc8181;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);

  --scrollbar-bg: transparent;
  --scrollbar-thumb: rgba(255, 255, 255, 0.1);
  --scrollbar-thumb-hover: rgba(255, 255, 255, 0.2);

  /* ----- SIZING ----- */
  --reading-width: 680px;
  --header-height: 64px;

  /* ----- USER SETTINGS (overridable) ----- */
  --user-font-size: 1.125rem;
  --user-line-height: 1.75;
  --user-anim-speed: 1;
}

/* ----- LIGHT THEME ----- */
[data-theme="light"] {
  --bg-primary: #faf8f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f0eee9;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-modal: #ffffff;
  --bg-card: rgba(0, 0, 0, 0.02);
  --bg-hover: rgba(0, 0, 0, 0.04);

  --text-primary: #2d3748;
  --text-secondary: #4a5568;
  --text-tertiary: #718096;
  --text-muted: #a0aec0;

  --accent: #5a8a9e;
  --accent-light: #7c9eb2;
  --accent-glow: rgba(90, 138, 158, 0.15);

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  --scrollbar-thumb: rgba(0, 0, 0, 0.1);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.2);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 30px rgba(90, 138, 158, 0.08);
}

/* ----- SEPIA THEME ----- */
[data-theme="sepia"] {
  --bg-primary: #f5e6c8;
  --bg-secondary: #f0dbb5;
  --bg-tertiary: #ebd2a3;
  --bg-glass: rgba(245, 230, 200, 0.7);
  --bg-modal: #f0dbb5;
  --bg-card: rgba(0, 0, 0, 0.02);
  --bg-hover: rgba(0, 0, 0, 0.05);

  --text-primary: #5c4033;
  --text-secondary: #7a5a4a;
  --text-tertiary: #9a7b6a;
  --text-muted: #ba9b8a;

  --accent: #8b6f5e;
  --accent-light: #a08270;
  --accent-glow: rgba(139, 111, 94, 0.15);

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  --scrollbar-thumb: rgba(0, 0, 0, 0.1);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.2);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* ----- NAVY THEME (azul escuro) ----- */
[data-theme="navy"] {
  --bg-primary: #0a1628;
  --bg-secondary: #0f1d35;
  --bg-tertiary: #13223d;
  --bg-glass: rgba(15, 29, 53, 0.7);
  --bg-modal: #0f1d35;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-hover: rgba(255, 255, 255, 0.06);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-muted: #475569;

  --accent: #60a5fa;
  --accent-light: #93c5fd;
  --accent-glow: rgba(96, 165, 250, 0.2);
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);

  --scrollbar-bg: transparent;
  --scrollbar-thumb: rgba(255, 255, 255, 0.1);
  --scrollbar-thumb-hover: rgba(255, 255, 255, 0.2);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(96, 165, 250, 0.08);
}

/* ----- SKY THEME (azul claro) ----- */
[data-theme="sky"] {
  --bg-primary: #eef6ff;
  --bg-secondary: #f8faff;
  --bg-tertiary: #dbeafe;
  --bg-glass: rgba(238, 246, 255, 0.8);
  --bg-modal: #ffffff;
  --bg-card: rgba(0, 0, 0, 0.02);
  --bg-hover: rgba(59, 130, 246, 0.06);

  --text-primary: #1e3a5f;
  --text-secondary: #3b5998;
  --text-tertiary: #6b89b4;
  --text-muted: #93aec9;

  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --success: #22c55e;
  --warning: #eab308;
  --error: #ef4444;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  --scrollbar-thumb: rgba(0, 0, 0, 0.1);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.2);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.1);
}

/* ----- HIGH CONTRAST ----- */
[data-high-contrast="true"] {
  --text-primary: #ffffff;
  --text-secondary: #e0e0e0;
  --bg-secondary: #000000;
  --bg-primary: #0a0a0a;
  --border-color: rgba(255, 255, 255, 0.3);
  --accent: #66bbff;
}

[data-high-contrast="true"][data-theme="light"] {
  --text-primary: #000000;
  --text-secondary: #1a1a1a;
  --bg-secondary: #ffffff;
  --bg-primary: #f5f5f5;
  --border-color: rgba(0, 0, 0, 0.4);
  --accent: #2255aa;
}

[data-high-contrast="true"][data-theme="navy"] {
  --text-primary: #ffffff;
  --text-secondary: #d0d9e6;
  --bg-secondary: #050e1c;
  --bg-primary: #020812;
  --border-color: rgba(255, 255, 255, 0.3);
  --accent: #66bbff;
}

[data-high-contrast="true"][data-theme="sky"] {
  --text-primary: #000000;
  --text-secondary: #1a1a2e;
  --bg-secondary: #ffffff;
  --bg-primary: #dceeff;
  --border-color: rgba(0, 0, 0, 0.4);
  --accent: #1a56db;
}

/* ----- CURSOR HIDE ----- */
[data-hide-cursor="true"] {
  cursor: none;
}
[data-hide-cursor="true"] * {
  cursor: none;
}

/* ----- BASE HTML ----- */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--user-font-size);
  line-height: var(--user-line-height);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  transition: background-color var(--anim-normal) var(--anim-ease),
              color var(--anim-normal) var(--anim-ease);
}

/* ----- SCROLLBAR ----- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* ============================================================
   TELA INICIAL
   ============================================================ */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--anim-normal) var(--anim-ease),
              transform var(--anim-normal) var(--anim-ease);
  z-index: 1;
}

.screen--hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.95);
}

/* Home Screen */
.home-screen {
  flex-direction: column;
  text-align: center;
  padding: var(--space-xl);
  gap: var(--space-lg);
}

.home-logo {
  width: 80px;
  height: 80px;
  margin-bottom: var(--space-sm);
  position: relative;
}

.home-logo svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(var(--shadow-glow));
}

.home-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-4xl);
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.1;
}

.home-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 400px;
  font-weight: 300;
  line-height: 1.6;
}

.home-session-indicator {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-full);
  background: var(--accent-glow);
  color: var(--accent-light);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  animation: session-pulse 2s ease-in-out infinite;
}

.home-session-indicator svg {
  flex-shrink: 0;
  animation: session-spin 3s linear infinite;
}

.session-timer {
  opacity: 0.7;
  font-size: 10px;
  margin-left: 2px;
}

@keyframes session-pulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

@keyframes session-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.home-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  max-width: 280px;
}

.home-buttons .btn {
  width: 100%;
}

.home-btn-resume {
  display: none;
}

.home-support {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-lg);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-tertiary);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--anim-normal) var(--anim-ease);
}

.home-support:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent-light);
  transform: translateY(-1px);
}

.home-support svg {
  flex-shrink: 0;
}

/* ----- BUTTONS ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--anim-normal) var(--anim-ease);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0.1) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--anim-normal) var(--anim-ease);
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn--primary:hover {
  box-shadow: 0 6px 30px var(--accent-glow);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn--ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.btn--icon {
  padding: var(--space-sm);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  transition: all var(--anim-normal) var(--anim-ease);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn--icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn--icon svg {
  width: 20px;
  height: 20px;
}

/* ============================================================
   MODAL
   ============================================================ */

/* PDF Import Button */
#pdf-input {
  display: none;
}

.btn--small {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  gap: 6px;
}

.btn--small svg {
  width: 14px;
  height: 14px;
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}

.modal-footer-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.modal-footer-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--anim-normal) var(--anim-ease);
  padding: var(--space-lg);
}

.modal-overlay--visible {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--bg-modal);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  width: 100%;
  max-width: 720px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--anim-normal) var(--anim-spring);
}

.modal-overlay--visible .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--text-primary);
}

.modal-body {
  flex: 1;
  min-height: 0;
}

.modal-body textarea {
  width: 100%;
  height: 350px;
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  resize: vertical;
  outline: none;
  transition: border-color var(--anim-normal) var(--anim-ease);
}

.modal-body textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.modal-body textarea::placeholder {
  color: var(--text-muted);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
}

/* ============================================================
   READING SCREEN
   ============================================================ */
.reading-screen {
  flex-direction: column;
  padding: 0;
  gap: 0;
  z-index: 1;
}

.reading-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  z-index: 4;
  flex-shrink: 0;
}

.reading-toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--anim-fast) var(--anim-ease);
}

.reading-toolbar-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.reading-toolbar-btn:active {
  transform: scale(0.95);
}

.reading-toolbar-btn svg {
  flex-shrink: 0;
  opacity: 0.7;
}

.reading-toolbar-btn--active {
  background: var(--accent-glow);
  color: var(--accent-light);
  border-color: var(--accent);
}

.reading-toolbar-btn--active svg {
  opacity: 1;
}

.reading-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: var(--space-4xl) var(--space-xl);
  position: relative;
  overflow: hidden;
}

.reading-block {
  max-width: var(--reading-width);
  width: 100%;
  font-size: var(--user-font-size);
  line-height: var(--user-line-height);
  color: var(--text-primary);
  text-align: left;
  position: relative;
  padding: var(--space-xl) 0;
}

.reading-block--enter {
  opacity: 0;
  transform: translateY(20px);
}

.reading-block--exit {
  opacity: 0;
  transform: translateY(-20px);
}

/* Click navigation zones */
.nav-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 30%;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  padding: var(--space-xl);
  opacity: 0;
  transition: opacity var(--anim-normal) var(--anim-ease);
}

.nav-zone:hover {
  opacity: 1;
}

.nav-zone--prev {
  left: 0;
  justify-content: flex-start;
}

.nav-zone--next {
  right: 0;
  justify-content: flex-end;
}

.nav-zone svg {
  width: 32px;
  height: 32px;
  color: var(--text-tertiary);
  opacity: 0;
  transition: opacity var(--anim-normal) var(--anim-ease),
              transform var(--anim-normal) var(--anim-ease);
}

.nav-zone:hover svg {
  opacity: 0.5;
}

.nav-zone--prev:hover svg {
  transform: translateX(-4px);
}

.nav-zone--next:hover svg {
  transform: translateX(4px);
}

/* ----- PROGRESS BAR ----- */
.progress-bar-container {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  z-index: 3;
}

.progress-track {
  flex: 1;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--anim-normal) var(--anim-ease);
  width: 0%;
}

.progress-text {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  min-width: 60px;
  text-align: right;
  font-family: var(--font-mono);
}

.btn-exit-reading {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--anim-fast) var(--anim-ease);
  flex-shrink: 0;
  margin-left: var(--space-sm);
}

.btn-exit-reading:hover {
  background: var(--bg-hover);
  color: var(--error);
  border-color: var(--error);
}

.btn-exit-reading svg {
  flex-shrink: 0;
}

/* ============================================================
   SETTINGS PANEL
   ============================================================ */
.settings-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 50;
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 360px;
  max-width: 90vw;
  background: var(--bg-modal);
  border-left: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  z-index: 200;
  padding: var(--space-2xl);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--anim-normal) var(--anim-ease);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  pointer-events: none;
}

.settings-panel--open {
  transform: translateX(0);
  pointer-events: auto;
}

.settings-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 199;
  opacity: 0;
  transition: opacity var(--anim-normal) var(--anim-ease);
  pointer-events: none;
}

.settings-panel-backdrop--visible {
  opacity: 1;
  pointer-events: auto;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.settings-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--text-primary);
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.settings-group-title {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  font-weight: 600;
}

.settings-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

.settings-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  flex: 1;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Info Icon Tooltip */
.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  font-size: 11px;
  font-style: normal;
  cursor: help;
  position: relative;
  flex-shrink: 0;
  transition: all var(--anim-fast) var(--anim-ease);
}

.info-icon:hover {
  background: var(--accent);
  color: #fff;
}

.info-icon::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 400;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--anim-fast) var(--anim-ease);
  z-index: 300;
  max-width: 280px;
  white-space: normal;
  line-height: 1.4;
}

.info-icon:hover::after {
  opacity: 1;
}

.info-icon::before {
  content: '';
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--border-color);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--anim-fast) var(--anim-ease);
}

.info-icon:hover::before {
  opacity: 1;
}

/* Toggle Switch */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--anim-normal) var(--anim-ease);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: all var(--anim-normal) var(--anim-ease);
}

.toggle input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
  background: #ffffff;
}

/* Theme Selector */
.theme-selector {
  display: flex;
  gap: var(--space-sm);
}

.theme-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  cursor: pointer;
  transition: all var(--anim-normal) var(--anim-ease);
  position: relative;
}

.theme-btn:hover {
  transform: scale(1.1);
}

.theme-btn--active {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.theme-btn--dark {
  background: #1f2937;
}

.theme-btn--light {
  background: #faf8f5;
}

.theme-btn--sepia {
  background: #f5e6c8;
}

.theme-btn--navy {
  background: #0f1d35;
}

.theme-btn--sky {
  background: #dbeafe;
}

/* Range Slider */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
  flex-shrink: 0;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform var(--anim-fast) var(--anim-ease);
  box-shadow: 0 0 8px var(--accent-glow);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* Select */
.settings-select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  outline: none;
  cursor: pointer;
}

.settings-select:focus {
  border-color: var(--accent);
}

/* ----- AMBIENT SOUND SELECTOR ----- */
.ambient-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.ambient-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--anim-normal) var(--anim-ease);
}

.ambient-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.ambient-btn--active {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent-light);
}

.ambient-btn--playing .ambient-indicator {
  animation: pulse-dot 1s ease-in-out infinite;
}

.ambient-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ============================================================
   RESUME MODAL
   ============================================================ */
.resume-modal .modal {
  max-width: 440px;
  text-align: center;
}

.resume-text {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.6;
}

.resume-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

/* ============================================================
   KEYBOARD HINT
   ============================================================ */
.keyboard-hint {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  font-size: var(--font-size-xs);
  z-index: 5;
  opacity: 0;
  transition: opacity var(--anim-slow) var(--anim-ease);
  pointer-events: none;
}

.keyboard-hint--visible {
  opacity: 1;
}

.key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 22px;
  padding: 0 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.keyboard-hint-text {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================================
   TOAST / NOTIFICATION
   ============================================================ */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  z-index: 300;
  opacity: 0;
  transition: all var(--anim-normal) var(--anim-ease);
  pointer-events: none;
  box-shadow: var(--shadow-md);
}

.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   LOADING / TRANSITIONS
   ============================================================ */
.fade-enter {
  opacity: 0;
}
.fade-enter-active {
  opacity: 1;
  transition: opacity calc(var(--anim-normal) * var(--user-anim-speed)) var(--anim-ease);
}
.fade-exit {
  opacity: 1;
}
.fade-exit-active {
  opacity: 0;
  transition: opacity calc(var(--anim-normal) * var(--user-anim-speed)) var(--anim-ease);
}

.slide-up-enter {
  opacity: 0;
  transform: translateY(30px);
}
.slide-up-enter-active {
  opacity: 1;
  transform: translateY(0);
  transition: all calc(var(--anim-normal) * var(--user-anim-speed)) var(--anim-ease);
}

.scale-enter {
  opacity: 0;
  transform: scale(0.9);
}
.scale-enter-active {
  opacity: 1;
  transform: scale(1);
  transition: all calc(var(--anim-normal) * var(--user-anim-speed)) var(--anim-spring);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2.5rem;
    --reading-width: 100%;
  }

  .home-title {
    font-size: var(--font-size-3xl);
  }

  .modal {
    padding: var(--space-lg);
    max-height: 90vh;
  }

  .modal-body textarea {
    height: 250px;
    padding: var(--space-md);
  }

  .reading-content {
    padding: var(--space-2xl) var(--space-lg);
  }

  .settings-panel {
    width: 100%;
    max-width: 100vw;
  }

  .nav-zone {
    width: 25%;
  }

  .nav-zone svg {
    display: none;
  }

  .keyboard-hint {
    bottom: var(--space-lg);
    padding: var(--space-xs) var(--space-md);
  }

  .keyboard-hint-text .key {
    display: none;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-base: 1rem;
  }

  .home-logo {
    width: 60px;
    height: 60px;
  }

  .home-title {
    font-size: var(--font-size-2xl);
  }

  .reading-content {
    padding: var(--space-xl) var(--space-md);
  }

  .progress-bar-container {
    padding: var(--space-sm) var(--space-md);
  }

  .ambient-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   REDUCED MOTION & ANIMATIONS OFF
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

[data-animations-enabled="false"] *,
[data-animations-enabled="false"] *::before,
[data-animations-enabled="false"] *::after {
  transition-duration: 0.01ms !important;
  animation-duration: 0.01ms !important;
}

/* ============================================================
   SPOTIFY MINI PLAYER (compacto, flutuante canto inferior esquerdo)
   ============================================================ */
.mini-player {
  position: fixed;
  bottom: 68px;
  left: 16px;
  width: 300px;
  max-width: calc(100vw - 32px);
  background: var(--bg-modal);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: 55;
  transition: opacity 0.25s var(--anim-ease), visibility 0.25s var(--anim-ease);
}

.mini-player--hidden {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

.mini-player-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.mini-player-logo {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.7;
}

.mini-player-title {
  font-size: 10px;
  color: var(--text-tertiary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  flex: 1;
}

.mini-player-close {
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-size: 16px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color var(--anim-fast) var(--anim-ease);
}

.mini-player-close:hover {
  color: var(--text-primary);
}

.mini-player-embed {
  width: 100%;
  line-height: 0;
}

.mini-player-embed iframe {
  display: block;
  border-radius: 0;
  height: 80px !important;
}

@media (max-width: 480px) {
  .mini-player {
    bottom: 64px;
    left: 12px;
    right: 12px;
    width: auto;
    max-width: none;
  }
}

/* ============================================================
   SPOTIFY
   ============================================================ */
.spotify-container {
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-tertiary);
  min-height: 152px;
  transition: all var(--anim-normal) var(--anim-ease);
}

.spotify-container iframe {
  border-radius: var(--radius-sm);
}

.spotify-url-input {
  flex: 1;
  min-width: 0;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  outline: none;
  transition: border-color var(--anim-fast) var(--anim-ease);
}

.spotify-url-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.spotify-url-input::placeholder {
  color: var(--text-muted);
}

.spotify-hint {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  font-style: italic;
  line-height: 1.4;
}

/* ============================================================
   CRÉDITOS / FOOTER
   ============================================================ */

.credits-suggestion {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.credits-suggestion svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  opacity: 0.6;
}

.credits-suggestion span {
  color: var(--text-tertiary);
  font-weight: 500;
}
.credits-group {
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
}

.credits-content {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.credits-logo {
  opacity: 0.5;
  flex-shrink: 0;
}

.credits-text {
  font-weight: 600;
  letter-spacing: 0.03em;
  flex: 1;
}

.credits-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all var(--anim-fast) var(--anim-ease);
}

.credits-link:hover {
  color: var(--accent);
  background: var(--accent-glow);
}

/* ============================================================
   DANGER BUTTON (limpar sessão, etc.)
   ============================================================ */
.settings-danger-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid rgba(252, 129, 129, 0.3);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--error);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--anim-fast) var(--anim-ease);
}

.settings-danger-btn:hover {
  background: rgba(252, 129, 129, 0.1);
  border-color: var(--error);
}

.settings-danger-btn:active {
  transform: scale(0.97);
}

.settings-danger-btn svg {
  flex-shrink: 0;
  opacity: 0.7;
}

.settings-divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--space-sm) 0;
}

/* ============================================================
   FOCUS VISIBLE
   ============================================================ */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible) {
  outline: none;
}